package com.huali.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(value = "/admin.html")
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        HttpSession session = request.getSession();

        Object user = session.getAttribute("user");
        //判断用户是否登录
        if (user != null) {
            //继续执行请求 放行
            filterChain.doFilter(request, response);
            //结束当前过滤器
            return;
        }
        // 未登录 跳转到登录页面 二选一
        request.getRequestDispatcher("/login.html").forward(request, response);
//        response.sendRedirect("/login.html");

    }

    @Override
    public void destroy() {

    }
}
